TH350 Clutch Module 1969, new and ready to install. Fits the TH350. Ships fast from the USA.
This is a Raybestos Powertrain RGPZ-011 GPZ friction module for the GM Turbo 350, the high-heat clutch pack people reach for when a TH350 behind a built small-block or big-block has started slipping, flaring between gears or cooking its fluid. Our listing is titled for 1969, the first year of the TH350, and Raybestos catalogs this same module for 1969-1986 TH350 units, so it also fits the later Chevelle, Nova, Camaro, Firebird, Cutlass and C10 builds that use the same case. Inside are 17 friction plates: 9 GPZ forward and direct frictions, 5 high-static low/reverse frictions and 3 GPZ intermediate frictions.
The Turbo 350 builds its three speeds from four clutch packs, one band and two roller clutches. The forward clutch is on in every Drive gear. The intermediate clutch, housed in the pump, holds the sun gear for 2nd and stays on in 3rd. The direct clutch locks the sun gear to the input for 3rd and Reverse. The low and reverse clutch at the back of the case holds the reaction carrier in manual Low and in Reverse. Each pack alternates friction plates with steel plates and is squeezed by a hydraulic piston. GPZ is the Raybestos performance material; the maker rates it for higher heat resistance and higher torque capacity than OE-style lining, which matters most on a 1-2 and 2-3 shift that has to hold extra power. The low/reverse plates in this module are a high-static grade, built to grip without creeping.
The TH350 is a fully hydraulic transmission with no computer, so there are no trouble codes to read; diagnosis comes from road testing, line pressure and what you find in the pan.
Rule out the cheap causes first. A low fluid level, a leaking vacuum modulator or a misadjusted kickdown cable can each make a healthy Turbo 350 shift soft or late. Then match the slip to the range: a slip only in 3rd and Reverse points to the direct clutch, while slip in every gear is more likely a pressure problem than a single pack. GM's own diagnosis chart lists a 2nd gear start, or slip in 2nd only, under the intermediate clutch, including the wrong plate count. Our TH350 common problems and fixes guide walks the range-by-range logic, and the delayed engagement guide covers a slow Drive or Reverse.
The listing title says 1969, and Raybestos lists RGPZ-011 for GM TH350 from 1969 to 1986. Plate counts were not identical across every TH350 model code: the 1975 GM service manual shows the intermediate clutch with three or two plates and the low and reverse clutch with five or four, depending on the unit. Before you order, read the model code on the case and count the plates you take out of each drum. If your unit carries more forward and direct plates than this module, as some heavy-duty and lockup TH350C builds do, ask us first. Send your year and VIN or case code if you are unsure, and browse every part for this unit on our TH350 parts page.
| Fits | TH350 1969 |
| Part type | Clutch Module |
| Condition | New |
| Brand | Raybestos |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Raybestos catalogs RGPZ-011 for GM TH350 from 1969 to 1986. Plate counts vary by model code, so count the plates in each of your drums and compare them to the 9 forward/direct, 5 low/reverse and 3 intermediate in this module before you install it.
No. This is a friction module only. GM says steels can be reused if they are smooth with an even color; replace any with heat spots or scuffing.
GPZ is the Raybestos performance friction material, rated by the maker for higher heat resistance and torque capacity than OE lining. It suits a TH350 behind added power, towing or hard street use. A stock rebuild can use an OE-style pack.
At least 30 minutes in clean Dexron ATF before assembly, so the lining is fully saturated when the pack first applies.
Piston seals and gaskets from an overhaul kit at minimum. Also check the drum bushings, sealing rings and the intermediate overrun band while the unit is apart.
Not by themselves. Late, firm or soft shifts with no slip are usually the modulator, kickdown cable or governor. New clutches fix slip, flare and burnt plates.
